M25 service areas

Benson

We are off on our annual trip to France shortly and use the M25 for part of the journey to Dover. Has anyone any info on the service areas at Clackett Lane and the new one at Cobham? I am particularly interested in the parking facilities for caravans,i.e.
are they adequate, signposted,easy to access,etc., as well as the eating opportunities. Any advice would be most welcome.